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Wondering if sex before IUI is safe or recommended? Learn about the best timing, potential risks, and fertility tips to support your chances of conception.

Getting Pregnant

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Published on 15 Jul 2025

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By Thomson Team

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Our IUI specialist

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How to support IUI success

Improving your chances of success with IUI goes beyond just timing, it also involves taking care of your overall health and well-being. A balanced lifestyle and effective stress management play key roles in enhancing fertility outcomes.

Here are some tips you can follow to support IUI success, such as:

  • Eat a nutrient-rich diet: 

    • Focus on foods high in protein, antioxidants, omega-3 fatty acids, and essential vitamins to support reproductive health.

  • Stay hydrated: 

    • Aim to drink 2 to 3 litres of water per day to keep your body functioning optimally.

  • Maintain a healthy weight: 

    • Keeping your BMI within the normal range can help regulate hormones and improve fertility.

  • Exercise regularly: 

    • Gentle, moderate-intensity activities like brisk walking or swimming are beneficial for hormone balance and overall health.

  • Prioritise sleep: 

    • Aim for 7 to 9 hours of quality sleep each night to support your body’s natural reproductive functions.

  • Avoid alcohol and smoking: 

    • Both habits have been shown to lower fertility and reduce the success rate of IUI procedures.

  • Manage stress effectively: 

    • Techniques such as meditation, deep breathing, and maintaining a positive mindset can help support hormonal balance and emotional well-being during treatment.

To help you achieve your fertility goals and maintain your conception chance after IUI, request an appointment with Thomson Medical. Our fertility specialist can help by providing you tailored lifestyle choices that support your fertility journey.

FAQ

Is it better to abstain from sex before IUI?

Yes, but the key reason is to improve sperm quality, not to avoid intimacy altogether. The recommendation for your partner to abstain from ejaculation for 2 to 5 days before the procedure is aimed at boosting sperm concentration and motility for the sample used during IUI. It's a short-term strategy to optimise your chances of conception.

What should you avoid before an IUI procedure?

To support a successful IUI, here are key things to avoid:

  • No ejaculation for 2–5 days before IUI
  • Avoid high stress
  • Skip strenuous exercise
  • Avoid smoking and alcohol
  • Stay away from hot baths, saunas, and hot tubs
  • Limit caffeine intake

How can you increase your chances of IUI success?

Here are some tips to help improve your chances of conceiving following an IUI procedure:

  • Eat a balanced diet rich in protein, antioxidants, omega-3s, and vitamins
  • Drink 2–3 litres of water daily to stay hydrated
  • Maintain a healthy BMI to support fertility
  • Do moderate exercise like brisk walking or swimming
  • Get 7–9 hours of quality sleep each night
  • Avoid smoking and alcohol, as they can lower success rates

Does having sex before IUI affect success rates?

Yes, it can. If your partner ejaculates too close to the IUI procedure. Ejaculation within 2–5 days before sperm collection may reduce sperm count and motility, which could lower the chances of success. Following the recommended abstinence period helps ensure a stronger, healthier sperm sample for the best possible outcome.

Can IUI be successful on the first try?

Yes, IUI can be successful on the first attempt, but it varies for each couple. While some achieve pregnancy on their first cycle, it’s more common to conceive after 3 to 4 attempts. Success rates tend to improve slightly over multiple cycles, depending on factors like age, fertility health, and timing.

How long can sperm sit before IUI?

Once collected, sperm is typically processed and used for IUI within 1 to 2 hours. Fresh sperm should not be left unprocessed for long, as motility and quality can decline over time. If frozen sperm is used, it is thawed and prepared shortly before the procedure to ensure the best chance of success.

Is it possible to use unwashed sperm in IUI?

Technically, unwashed sperm can be used in IUI, but it is not recommended. Unwashed semen contains proteins and other components that may trigger uterine cramping, inflammation, or immune reactions, as the body may treat it as a foreign substance.

To ensure safety and improve the chances of conception, sperm washing is routinely performed before IUI. This lab process separates motile (active) sperm from seminal fluid, dead sperm, and debris, which results in a clean, concentrated sample. The washed sperm is then inserted directly into the uterus using a thin catheter, increasing the likelihood of successful fertilisation.

Do I need to avoid pregnancy tests after IUI?

Yes, it’s best to wait at least 14 days after the IUI before taking a pregnancy test. Testing too early can lead to false positives or false negatives, especially if you’ve had a trigger shot (hCG injection), as the hormone may still be in your system and affect the result.

Your doctor may schedule a blood test (beta-hCG) around two weeks after the procedure for the most accurate confirmation.

If you're considering IUI as a fertility treatment option, request a consultation with our fertility specialists at the Thomson Fertility Centre for personalised recommendations and tailored advice.

For more information, contact us:

Thomson Fertility Centre

Request an Appointment